Single-tower pressurized side-line ammonia extraction process. What causes a low ammonia extraction rate?
Thread Content
We have installed a wastewater stripping tower, using a single-tower pressurized side-line ammonia extraction process. The management requires that the pressure at the top of the tower be maintained between 0.2 and 0.3 Mpa, with the temperature at the top of the tower at 120°C and at the bottom of the tower at 147°C. The ammonia extraction temperature is 135–138°C, and the opening degree of the ammonia extraction control valve is around 25%; if it is opened further, severe liquid entrainment will occur. I was wondering what’s going on here – could it be that the pressure at the top of the tower is too low and the temperature there is too high?
For ammonia extraction via a side stream on the pressurized side of a single tower, why are all the parameters different from ours, except for the temperature of the side stream? Are the parameters used based on control methods for extraction without a side stream? The temperature at the top of the tower is 120 degrees Celsius, and the ammonia is extracted from there
Ammonia nitrogen content: 20,800 mg/L
The ammonia nitrogen level is very high; our parameters differ significantly from yours. The top temperature is less than 45, the pressure is around 0.5 Mpa, the bottom temperature is around 160, and the temperature at the side draw is around 150. This information is provided for your reference
Distillation operations must ensure three types of equilibrium: material balance, gas-liquid equilibrium, and heat balance. Does the situation mentioned by the poster, where an increase in the opening of the ammonia extraction control valve on the side line results in liquid entrainment, disrupt the material balance and thereby compromise the gas-liquid equilibrium inside the tower?
Thank you. What material is the tube bundle of the bottom reboiler in your facility made of?
The operating pressure at the top of the tower is low; can the ammonia content there be kept under control? Are there any tower top gas analysis data?
600,000 ppm hydrogen sulfide and 28,000 Pmm ammonia were used